Drill-press attachment



(M'udeL) J. G. POPE.

Drill Press Attachment.

No. 234,687. Patented Nov. 23,1880.

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JOHN G. POPE, OF BLOOMINGTON, ILLINOIS.

DRI LL-PRESS ATTACH M ENT.

SPECIFICATION forming part of Letters Patent No. 234,687, dated November 23, 1880.

Application filed April 28, 1880.

To all whom it may concern:

Be it known that I, JOHN G. POPE, of the city of Bloomington, county of McLean. and State of Illinois, have invented a new and useful Improvement in Drill-Press Attachments for Outting Flue-Sheets and other Purposes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, in which Figure 1 is a plan view of an attachment embodying my invention. Fig.2 is a crosssection taken on the line or 00, Fig. 1. Fig. 3 is a cross-section taken on the line 3 y, Fig. 1. Fig. at is an end elevation of the cutter-head, and Fig. 5 is a cross-section of the same.

The object of my invention is to provide a simple and effective attachment to a drill-press, whereby the holes in a flue-sheet for the insertion of the flues may be easily and rapidly out.

My invention consists in a metallic sleeve provided at one end with an enlarged socket, which couples over the cross-piece of a drillpress and is fastened thereto by set-screws, and having at the other end an outer flange, through which passes a short rod having rigidly attached at its outer end a pawl and at its inner end a handle for raising the pawl, the flange also being provided with a spring for holding the pawl in place. Within the flanged end of the sleeve is inserted a spindle, which, at its inner end, fits within the drillpress socket, through which motion is communicated to it, while the sleeve remains stationary. Upon the outer end of the spindle is keyed a cutter-head provided with slots, in which cutters are inserted. The spindle is also provided with a novel feeding device, all of which will be hereinafter more fully explained, and pointed out definitely in-the claims.

In the drawings, A represents a metallic sleeve, provided at one end with an enlarged socket, a, which slips over the cross-piece of a drill-press, to which it is fastened by setscrews a. The sleeve A is provided at the other end with an exterior flange, a through a hole in which passes the short rod a having rigidly attached at its outer end the pawl a, and at its inner end, after passing through the short standard or support of, having rigidly attached the handle a The standard or supup by the handle.

(Model port a is rigidly attached to the sleeve A. On the rod a between the flange a and the standard a there is also rigidly attached the cam or lever a and firmly attached at one end to the inner side of the flange is the curved spring a the outer end of which rests upon the cam or lever a and consequently presses it and the outer pawl down until it is raised Through the flanged end of the sleeve A passes the spindle B, the inner end of which fits within the drill-press socket, and is fastened thereto, in the usual manner, through an aperture, a, in the sleeve A. On the outer portion of the spindle B there is keyed the steel flange 0, with a slight depression, 0, upon one portion of its edge, for a purpose hereinafter described. Upon the face of the flange adjacent to the sleeve is a curved plate, 0, with its outer edge corresponding to the edge of the flange O, and provided with a slot, 0 through which pass short set-screws 0 which fasten it to the flange O, and by their adjustment permit the plate 0 to extend over more or less of the depression 0 in the flange 0.

On the outer end of the spindle B there is keyed a cutter-head, D, provided with slots 01,

for holding the cutters d, which are adjusted and fastened in the cutter-head by set-screws (1 The cutters d are each provided with a cutting-edge in the usual form. The cutterhead is provided with a feather, d which fits within a keyway in the spindle, and is also provided on its inner side with a boss, d in which there is a groove, (1

The spindle B is provided, for a suitabledistance beyond the flange O, with a left-hand screw-thread, 1), upon which there is screwed the nut E. This nut is provided on its end adjacent to the flange O with a flange, e, which is a trifle smaller in diameter than the flange O, and teeth are cut around its edge so as to give it the form of a ratchet-wheel. The other end of the nut is recessed so as to pass over the boss 01 and set-screws 0 pass through the nut and engage in the groove 61 so as to turn freely therein and permit the nut to work independently. A hand-wheel, F, is fastened rigidly to the nut E by a set-screw, by which means the nut can be turned home after it has been fed out, as hereinafter explained. The outer end of the spindle B is preterablyformed into a center punch point.

The operation of my device is as follows: After the several parts have been adjusted in place, as hereinbefore described, the flue-sheet in which it is desired to cut holes is placed immediately under the cutter-head D, and motion is communicated to the spindle B, while the sleeve A remains stationary. With each revolution of the spindle B the pawl a, when it comes to the depression in the flange 0, drops within it, owing to the tension of the spring a and consequently engages in the teeth upon the edge of the flange e of the nut E. As the spindle continues to revolve, the nut is held stationary by the pawl a and therefore the spindle turns in the nut, which feeds the cutter-head along the spindle till the continued revolution of the spindle carries the depression 0 along beyond the pawl a which is consequently raised out of contact with the longer or shorter depression, 0, in the flange O. 5

hen, by the advance of the cutter-head, a

This distance is determined by hole is bored through the flue-sheet, the motion is stopped, and by raising the handle a the pawl a is removed from contact, and by turning the hand-wheel in the proper direction the nut is brought back to the place of beginning, when the process is repeated as before.

By the use of the above-described attachment holes of the required size may be cut in flue-sheets very rapidly, and with a great saving of time and labor over the methods heretofore employed for that purpose. It is also applicable to drills and other uses.

Having thus described my invent-ion, what I claim as new, and desire to secure by Letters Patent, is

1. The combination of the sleeve A, provided with flange a the pawl a, and the spindle B, havinga flange, (J, provided with the curved plate 0, with the flanged nut E and the cutter-head D, substantially as and for the purpose set forth.

2. The combination of the sleeve A, provided wlth flange (6 and pawl a, and the spindle 13, provided with a flange, G, the flanged v nut E, and the cutterhead l), substantially as and for the purpose described.

JOHN G. POPE. \Vitnesses A. S. KLEINDIENST, FRANK WHITE. 

